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Abstract:
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There is a continuous search for better and more natural human-computer interfaces. In the work the signal processing applications for three EMFi testing systems of human-computer interaction were implemented. EMFi was a new innovative elastic electrets film that could be used where is a need to monitor pressure or force changes, sound or movement. Each system consisted of EMFi sensors, amplifiers, analog-to-digital conversion, real-time signal processing and transmission over a TCP/IP based network. In the first system, sensors were attached to a normal mouse. This application attempted to detect the forces applied to the mouse, including the changes in the blood pressure of the user. For the second system, the sensors were attached to a chair. The heart rate detection was the main objective of this application. The heart rate was indirectly used to sense the emotional state of the user. The third system had as the main objective the detection of force resulted when a person steps on the floor. The location and the motion vectors were calculated from this force. The applications can acquire, analyze and transmit data to clients over the network. Offline data processing is also possible using the signal database resulting from each execution of the programs. /Kir10 |